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Native Americans built some of the most impressive defensive walls in the history of mankind. Even their ruins are magnificent. Here is one example from the city of Cusco in Peru. Some of the base stones are over 3.5 meters tall.
Of course, the fortress walls would have been the strongest, but the city had its own defensive wall, and in addition to this the city blocks were divided by tall, massive stone walls, leaving the streets like tiny canyons. Here is Callejón Loreto (Loreto Street).
When they didn't have stone they used adobe bricks or rammed earth, like in Chan-Chan, founded in 850 A.D. and once the largest city in Pre-Columbian South America, 40-60 000 people. It had an inner wall system 32km long, 50-60 ft high, 15-18 ft wide. The outer walls, 100s of km.
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